... cao ciy ty le thuan vdi thdi gian sinh trudng, d thdi vu gieo sdm 20/4 chilu cao ciy cao nhit dat 154cm. Cic thdi vu gieo 30/4, 10/5 va 20/5 cd chieu cao ciy sai khic nhau khdng ding kl cao ... lai hieu qui kinh te cao, Iii thuin cao han ddi chiing tu 1,1 trieu den 1,9 trieu ddng/ha (Dinh Quang Tuyen, 2004). Tai cic viing cd tiem ning thim canh bdng ning suit cao nhu Dien Bien, ... cao ty le thinh qua cing tang. Bdn phin vdi miic 240 kg N + 80 kg P2O5 + 80 kg KjO/ha cho sinh trudng chilu cao ciy, so lugng hoa qui tren ciy, khdi lugng qui vi F F nang suit bdng cao...